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Dunn County staff report 14% of private well samples high in nitrates as in-house testing expands
Summary
County conservation staff told the Planning, Resource and Development Committee that their 2025 groundwater-sampling program, funded initially with ARPA and later EPA support, found about 13.5–14% of samples above recommended nitrate levels; the county now uses the Dunn County Health Department lab and aims to recruit 300 participants for 2026.
A county conservation staff member told the Dunn County Planning, Resource and Development Committee on March 18 that the county’s groundwater-sampling program has shifted to in-house nitrate testing and that about 13.5–14% of samples returned high nitrate results in the most recent cycle. The program, staff said, was started with ARPA funding and later received EPA support.
The staff member said the Dunn County Health Department Water Lab now processes samples, which reduced costs and logistical delays compared with outsourcing. "The Dunn County Health Department Water Lab is processing all of our samples," the staff member said, adding that in-house testing also lets staff verify suspicious…
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